Add a CHECK() around the SharedMemory ftruncate() call to finger it as a crash culprit.
Add a CHECK() around the SharedMemory ftruncate() call to finger it as a crash culprit.

BUG=16371
TEST=Check the crash logs to see if this CHECK() supplants the CHECK() failure in AsyncResourceHandler::OnWillRead()
Review URL: http://codereview.chromium.org/347012

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@30530 0039d316-1c4b-4281-b951-d872f2087c98

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